CAT5259

© 2009 SCILLC. All rights reserved.

1

Doc. No. MD-2000 Rev. J

Characteristics subject to change without notice

NONVOLATILE

DATA

REGISTERS

CONTROL LOGIC

WIPER CONTROL

REGISTERS

I²C BUS

INTERFACE

SCL

SDA

WP

Quad Digitally Programmable Potentiometers

(DPP™) with 256 Taps and I²C Interface

FEATURES

Four linear taper digitally programmable

potentiometers

256 resistor taps per potentiometer

End to end resistance 50 kΩ or 100 kΩ

Potentiometer control and memory access via

I²C interface

Low wiper resistance, typically 100 Ω

Nonvolatile memory storage for up to four

wiper settings for each potentiometer

Automatic recall of saved wiper settings at

power up

2.5 to 6.0 volt operation

Standby current less than 1 µA

1,000,000 nonvolatile WRITE cycles

100 year nonvolatile memory data retention

24-lead SOIC and 24-lead TSSOP packages

Industrial temperature range

For Ordering Information details, see page 15.

PIN CONFIGURATION

SOIC (W)

TSSOP (Y)

NC

1

24 A3

A0

2

23 SCL

NC

6

19 NC

18 GND

A2 11

14 A1

12

13 SDA

DESCRIPTION

The CAT5259 is four digitally programmable poten–

tiometers (DPPs™) integrated with control logic and

16 bytes of NVRAM memory. Each DPP consists of a

series of resistive elements connected between two

externally accessible end points. The tap points

between each resistive element are connected to the

wiper outputs with CMOS switches. A separate 8-bit

control register (WCR) independently controls the

wiper tap switches for each DPP. Associated with

each wiper control register are four 8-bit non-volatile

memory data registers (DR) used for storing up to four

wiper settings. Writing to the wiper control register or

any of the non-volatile data registers is via a I²C serial

bus. On power-up, the contents of the first data

register (DR0) for each of the four potentiometers

is automatically loaded into its respective wiper

control registers.

The CAT5259 can be used as a potentiometer or as a

two terminal, variable resistor. It is intended for circuit

level or system level adjustments in a wide variety of

applications. It is available in the 0ºC to 70ºC

commercial and -40ºC to 85ºC industrial operating

temperature ranges and offered in a 24-lead SOIC

and TSSOP package.

FUNCTIONAL DIAGRAM